import {ShardingTest} from "jstests/libs/shardingtest.js";
import {findChunksUtil} from "jstests/sharding/libs/find_chunks_util.js";

var st = new ShardingTest({shards: 2, chunkSize: 1});

assert.commandWorked(
    st.s0.adminCommand({enableSharding: 'test', primaryShard: st.shard1.shardName}));
assert.commandWorked(st.s0.adminCommand({shardCollection: 'test.user', key: {x: 'hashed'}}));

var configDB = st.s0.getDB('config');
var chunkCountBefore = findChunksUtil.countChunksForNs(configDB, 'test.user');
assert.gt(chunkCountBefore, 1);

var testDB = st.s0.getDB('test');
for (var x = 0; x < 1000; x++) {
    testDB.user.insert({x: x});
}

var chunkDoc = findChunksUtil.findChunksByNs(configDB, 'test.user').sort({min: 1}).next();
var min = chunkDoc.min;
var max = chunkDoc.max;

// Assumption: There are documents in the MinKey chunk, otherwise, splitVector will fail.
//
// Note: This chunk will have 267 documents if collection was presplit to 4.
var cmdRes = assert.commandWorked(st.s0.adminCommand({split: 'test.user', bounds: [min, max]}),
                                  'Split on bounds failed for chunk [' + tojson(chunkDoc) + ']');

chunkDoc = findChunksUtil.findChunksByNs(configDB, 'test.user').sort({min: 1}).skip(1).next();

var middle = NumberLong(chunkDoc.min.x + 1000000);
cmdRes = assert.commandWorked(st.s0.adminCommand({split: 'test.user', middle: {x: middle}}),
                              'Split failed with middle [' + middle + ']');

cmdRes = assert.commandWorked(st.s0.adminCommand({split: 'test.user', find: {x: 7}}),
                              'Split failed with find.');

var chunkList = findChunksUtil.findChunksByNs(configDB, 'test.user').sort({min: 1}).toArray();
assert.eq(chunkCountBefore + 3, chunkList.length);

chunkList.forEach(function(chunkToMove) {
    var toShard = configDB.shards.findOne({_id: {$ne: chunkToMove.shard}})._id;

    print('Moving chunk ' + chunkToMove._id + ' from shard ' + chunkToMove.shard + ' to ' +
          toShard + ' ...');

    assert.commandWorked(st.s0.adminCommand({
        moveChunk: 'test.user',
        bounds: [chunkToMove.min, chunkToMove.max],
        to: toShard,
        _waitForDelete: true
    }));
});

st.stop();
